50278 + Interview Questions in Physics Page 193 InterviewSolution

9601.	Two coherent monochromatic point sources S1 and S2 of wavelength λ=600nm are placed symmetrically on either side of the center of the circle as shown. The sources are separated by a distance d=1.8mm. This arrangement produces interference fringes visible as alternate bright and dark spots on the circumference of the circle. The angular separation between two consecutive bright spots is Δθ. Which of the following options is/are correct?
Answer» Two coherent monochromatic point sources $S_{1}$ and $S_{2}$ of wavelength $λ = 600 n m$ are placed symmetrically on either side of the center of the circle as shown. The sources are separated by a distance $d = 1.8 m m$ . This arrangement produces interference fringes visible as alternate bright and dark spots on the circumference of the circle. The angular separation between two consecutive bright spots is $Δ θ$ . Which of the following options is/are correct?

Discussion

9602.	Consider the MUX circuit shown in the figure below;the output function 'f' can be represented as
Answer» $Consider the MUX circuit shown in the figure below; the output function 'f' can be represented as$

Discussion

9603.	Two satellites are moving around the earth in circular orbits at height R and 3R respectively, R being the radius of the earth, the ratio of their kinetic energies is
Answer» Two satellites are moving around the earth in circular orbits at height R and 3R respectively, R being the radius of the earth, the ratio of their kinetic energies is

Discussion

9604.	The gravitational field in a region is given by E=(2i+3j)N/kg.The equation of the line on which no work is done by the gravitational when the particle is moved
Answer» The gravitational field in a region is given by E=(2i+3j)N/kg.The equation of the line on which no work is done by the gravitational when the particle is moved

Discussion

9605.	A solid conducting sphere of radius ′a′ is surrounded by a thin uncharged concentric conducting shell of radius 2a. A point charge q is placed at a distance 4a from common centre of conducting sphere and shell. The inner sphere is then grounded .The charge on the solid sphere is −qn. Find the value of n
Answer» A solid conducting sphere of radius $^{'} a^{'}$ is surrounded by a thin uncharged concentric conducting shell of radius $2 a$ . A point charge $q$ is placed at a distance $4 a$ from common centre of conducting sphere and shell. The inner sphere is then grounded .The charge on the solid sphere is $\frac{- q}{n}$ . Find the value of $n$

Discussion

9606.	Two identical conducting rods are first connected independently to two vessels, one containing water at 100∘C and the other containing ice at 0∘C. In the second case, the rods are joined end to end and connected to the same vessels. Let q1 and q2 gram per second be the rate of melting of ice in the two cases respectively. The ratio q1q2 is
Answer» Two identical conducting rods are first connected independently to two vessels, one containing water at $100^{\circ} C$ and the other containing ice at $0^{\circ} C$ . In the second case, the rods are joined end to end and connected to the same vessels. Let $q_{1}$ and $q_{2}$ gram per second be the rate of melting of ice in the two cases respectively. The ratio $\frac{q_{1}}{q_{2}}$ is

Discussion

9607.	A particle at rest is projected from the origin moves in x−y plane with a velocity of →v=(3^i+6x^j) m/s, where ^i and ^j are unit vectors along +x and +y axis. Which of the following equations represent the equation of path followed by the particle?
Answer» A particle at rest is projected from the origin moves in $x - y$ plane with a velocity of $\to v = (3^i + 6 x^j) m/s$ , where $^i$ and $^j$ are unit vectors along $+ x$ and $+ y$ axis. Which of the following equations represent the equation of path followed by the particle?

Discussion

9608.	State if each of the following statements is true or false. Give reasons for your answer. (a) In an elastic collision of two bodies, the momentum and energy of each body is conserved. (b) Total energy of a system is always conserved, no matter what internal and external forces on the body are present. (c) Work done in the motion of a body over a closed loop is zero for every force in nature. (d) In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system.
Answer» State if each of the following statements is true or false. Give reasons for your answer. (a) In an elastic collision of two bodies, the momentum and energy of each body is conserved. (b) Total energy of a system is always conserved, no matter what internal and external forces on the body are present. (c) Work done in the motion of a body over a closed loop is zero for every force in nature. (d) In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system.

Discussion

9609.	two charge reple each outher with a force of 200N % . one of the cgarges is increased by 20% and other is reduced by10%. the new repulsive force at same dis†an ce would be pjo
Answer» two charge reple each outher with a force of 200N % . one of the cgarges is increased by 20% and other is reduced by10%. the new repulsive force at same dis†an ce would be pjo

Discussion

9610.	Find dydx, if x and y are connected parametrically by the equations given in questions without eliminating the parameter. x=a cos θ, y=b cos θ
Answer» Find $\frac{d y}{d x}$ , if x and y are connected parametrically by the equations given in questions without eliminating the parameter. $x = a c o s θ, y = b c o s θ$

9610.

Find dydx, if x and y are connected parametrically by the equations given in questions without eliminating the parameter. x=a cos θ, y=b cos θ

Answer»

Find $\frac{d y}{d x}$ , if x and y are connected parametrically by the equations given in questions without eliminating the parameter.

$x = a c o s θ, y = b c o s θ$

Discussion

9611.	Force acting on a particle is 10 N. If units of length and time are doubled and the unit of mass is halved then find the numerical value of force in the new system of units.
Answer» Force acting on a particle is $10 N$ . If units of length and time are doubled and the unit of mass is halved then find the numerical value of force in the new system of units.

Discussion

9612.	Given figure shows a sound filter in which sound is passing through a bifurcated pipe. Speed of sound in air is 300 m/sec. A sound consists of four frequencies 300 Hz,600 Hz,900 Hz,1500 Hz. Then which of the following frequency will pass through outles
Answer» Given figure shows a sound filter in which sound is passing through a bifurcated pipe. Speed of sound in air is $300 m/sec$ . A sound consists of four frequencies $300 Hz, 600 Hz, 900 Hz, 1500 Hz$ . Then which of the following frequency will pass through outles

Discussion

9613.	Gravitational acceleration on the surface of a planet is √611g where g is the gravitational acceleration on the surface of the earth. The average mass density of the planet is 23 times that of the earth. If the escape speed on the surface of the earth is taken to be 11 kms–1, the escape speed on the surface of the planet in kms–1 will be
Answer» Gravitational acceleration on the surface of a planet is $\frac{\sqrt{6}}{11} g$ where $g$ is the gravitational acceleration on the surface of the earth. The average mass density of the planet is $\frac{2}{3}$ times that of the earth. If the escape speed on the surface of the earth is taken to be $11 k m s^{- 1}$ , the escape speed on the surface of the planet in $k m s^{- 1}$ will be

Discussion

9614.	A stationary horizontal disc is free to rotate about its axis. When a torque is applied on it, its kinetic energy as a function of θ, where θ is the angle by which it has rotated, is given as kθ2. If its moment of inertia is I, then the angular acceleration of the disc will be:
Answer» A stationary horizontal disc is free to rotate about its axis. When a torque is applied on it, its kinetic energy as a function of $θ$ , where $θ$ is the angle by which it has rotated, is given as $k θ^{2}$ . If its moment of inertia is I, then the angular acceleration of the disc will be:

Discussion

9615.	Energy of photon whose frequency is 1012MHz, will be
Answer» Energy of photon whose frequency is $10^{12} M H z$ , will be

Discussion

9616.	A light beam of wavelength 500 nm is incident on a metal having work function of 1.25 eV, placed in a magnetic field of intensity B. The electrons emitted perpendicular to the magnetic field B, with maximum kinetic energy, are bent into a circular arc of radius 30 cm. The value of B is ×10−7 T.Given hc=20×10−26 Jm, mass of electron me=9×10−31 kg
Answer» A light beam of wavelength $500 nm$ is incident on a metal having work function of $1.25 eV$ , placed in a magnetic field of intensity $B$ . The electrons emitted perpendicular to the magnetic field $B$ , with maximum kinetic energy, are bent into a circular arc of radius $30 cm$ . The value of $B$ is $\times 10^{- 7} T$ . Given $h c = 20 \times 10^{- 26} Jm$ , mass of electron $m_{e} = 9 \times 10^{- 31} kg$

Discussion

9617.	2.What is Magnetic Effect of Electric current?
Answer» 2.What is Magnetic Effect of Electric current?

Discussion

9618.	For moon, g=1.67 ms−2 and R=1.74×106 m.The Moon's mass is ___ ×1022 kg.7.6
Answer» For moon, $g = 1.67 m s^{- 2}$ and $R = 1.74 \times 10^{6} m$ . The Moon's mass is ___ $\times 10^{22} k g$ . 7.6

Discussion

9619.	29. A particle is projected with velocity 2\sqrt{}g\sqrt{}h such that it crosses two walls of height h separated by 2h .What is the angle of projection?
Answer» 29. A particle is projected with velocity 2\sqrt{}g\sqrt{}h such that it crosses two walls of height h separated by 2h .What is the angle of projection?

Discussion

9620.	Find the flux of the electric field through a spherical surface of radius R due to a charge of 10−7 C at the centre and another equal charge at a point 2R away from the centre.(Take ϵo=9×10−12 C2/N-m2 )
Answer» Find the flux of the electric field through a spherical surface of radius $R$ due to a charge of $10^{- 7} C$ at the centre and another equal charge at a point $2 R$ away from the centre. (Take $ϵ_{o} = 9 \times 10^{- 12} C^{2} / {N-m}^{2}$ )

Discussion

9621.	A vertical off-shore structure is built to withstand a maximum stress of 109 Pa. Is the structure suitable for putting up on top of an oil well in the ocean? Take the depth of the ocean to be roughly 3 km, and ignore ocean currents.
Answer» A vertical off-shore structure is built to withstand a maximum stress of 10⁹ Pa. Is the structure suitable for putting up on top of an oil well in the ocean? Take the depth of the ocean to be roughly 3 km, and ignore ocean currents.

Discussion

9622.	17. A water storage tank placed on the top of a building contains 103 L of water in it. It is receiving energy from the sun causing the heating effect of water. How much energy in joules would be required to raise the temperature of water from 30^° C to 35^° C? Given the specific heat of water is 4.184 JK–1g–1.
Answer» 17. A water storage tank placed on the top of a building contains 103 L of water in it. It is receiving energy from the sun causing the heating effect of water. How much energy in joules would be required to raise the temperature of water from 30^° C to 35^° C? Given the specific heat of water is 4.184 JK–1g–1.

Discussion

9623.	Three rods of equal lengths are joined to form an equilateral triangle PQR as shown in the figure. O is the mid point of PQ and distance OR remains same for any small change in temperature. If the coefficient of linear expansion for PR and RQ is same i.e, α2, but that for PQ is α1, then which of the following options correctly represents the relation between α1 and α2?
Answer» Three rods of equal lengths are joined to form an equilateral triangle $PQR$ as shown in the figure. $O$ is the mid point of $PQ$ and distance $OR$ remains same for any small change in temperature. If the coefficient of linear expansion for $PR$ and $RQ$ is same i.e, $α_{2}$ , but that for $PQ$ is $α_{1}$ , then which of the following options correctly represents the relation between $α_{1}$ and $α_{2}$ ?

Discussion

9624.	How neutron made
Answer» How neutron made

Discussion

9625.	35.Two points A and B lying on Y-axis at distance 12.3 cm and 12.5 cm from the origin. The potentials at these points are 56 V and 54.8 V respectively, then the component of force on a charge of 4 micro C placed at A along Y-axis will be?
Answer» 35.Two points A and B lying on Y-axis at distance 12.3 cm and 12.5 cm from the origin. The potentials at these points are 56 V and 54.8 V respectively, then the component of force on a charge of 4 micro C placed at A along Y-axis will be?

Discussion

9626.	A bullet leaving the muzzle of a rifle barrel with a velocity v penetrated a plank and loses one-fifth of its velocity. It then strikes second plank, which it just penetrates through. Supposing the average resistance to the penetration is same in both the cases, the ratio of the thickness of the planks will be:
Answer» A bullet leaving the muzzle of a rifle barrel with a velocity $v$ penetrated a plank and loses one-fifth of its velocity. It then strikes second plank, which it just penetrates through. Supposing the average resistance to the penetration is same in both the cases, the ratio of the thickness of the planks will be:

Discussion

9627.	What is the minimum speed I need to cross the river which is flowing in the west direction at 3 Km/hr? Beware of the crocodiles.
Answer» What is the minimum speed I need to cross the river which is flowing in the west direction at 3 Km/hr? Beware of the crocodiles.

Discussion

9628.	A satellite of mass m, initially at rest on the earth, is launched into a circular orbit at a height equal to the radius of the earth. The minimum energy required is xmgRy, where x and y are numbers. Find the value of x + y. ___
Answer» A satellite of mass m, initially at rest on the earth, is launched into a circular orbit at a height equal to the radius of the earth. The minimum energy required is $\frac{x m g R}{y}$ , where x and y are numbers. Find the value of x + y. ___

9628.

A satellite of mass m, initially at rest on the earth, is launched into a circular orbit at a height equal to the radius of the earth. The minimum energy required is xmgRy, where x and y are numbers. Find the value of x + y. ___

Answer»

A satellite of mass m, initially at rest on the earth, is launched into a circular orbit at a height equal to the radius of the earth. The minimum energy required is $\frac{x m g R}{y}$ , where x and y are numbers. Find the value of x + y.

___

Discussion

9629.	A block placed on a horizontal surface is being pushed by a force F making an angle θ with the vertical. If the friction coefficient is μ, how much force is needed to get the block just started.
Answer» A block placed on a horizontal surface is being pushed by a force F making an angle $θ$ with the vertical. If the friction coefficient is $μ$ , how much force is needed to get the block just started.

Discussion

9630.	A mass m moves in a circle on a smooth horizontal plane with velocity v0 at a radius R0. The mass is attached to a string which passes through a smooth hole in the plane as shown.The tension in the string is increased gradually and finally m moves in a circle of radius R0/2. Then, the final value of the kinetic energy of particle is
Answer» A mass $m$ moves in a circle on a smooth horizontal plane with velocity $v_{0}$ at a radius $R_{0}$ . The mass is attached to a string which passes through a smooth hole in the plane as shown. The tension in the string is increased gradually and finally $m$ moves in a circle of radius $R_{0} / 2$ . Then, the final value of the kinetic energy of particle is

Discussion

9631.	Two unchanged spheres are rubbed together and then separated by a distance of 2cm in air. If the force of attraction between them is 22.5N. Then the number of electrons lost by positively charged sphere is
Answer» Two unchanged spheres are rubbed together and then separated by a distance of 2cm in air. If the force of attraction between them is 22.5N. Then the number of electrons lost by positively charged sphere is

Discussion

9632.	Just outside a sharp point on a conductor we will have a larger electric field than just outside gradually curving palces on the conductor,why not voltage
Answer» Just outside a sharp point on a conductor we will have a larger electric field than just outside gradually curving palces on the conductor,why not voltage

Discussion

9633.	At 0∘C pressure measured by barometer is 760 mm. What will be pressure at 100∘C
Answer» At $0^{\circ} C$ pressure measured by barometer is 760 mm. What will be pressure at $100^{\circ} C$

Discussion

9634.	A sphere of mass M and radius R2 has a concentric cavity of radius R1 as shown in figure. The force F exerted by the sphere on a particle of mass m located at a distance r from the center of sphere varies as (0 ≤ r ≤ ∞)
Answer» A sphere of mass M and radius R₂ has a concentric cavity of radius R_{1 as} shown in figure. The force F exerted by the sphere on a particle of mass m located at a distance r from the center of sphere varies as (0 $\leq$ r $\leq$ ∞)

9634.

A sphere of mass M and radius R2 has a concentric cavity of radius R1 as shown in figure. The force F exerted by the sphere on a particle of mass m located at a distance r from the center of sphere varies as (0 ≤ r ≤ ∞)

Answer»

A sphere of mass M and radius R₂ has a concentric cavity of radius R_{1 as} shown in figure. The force F exerted by the sphere on a particle of mass m located at a distance r from the center of sphere varies as (0 $\leq$ r $\leq$ ∞)

Discussion

9635.	A narrow pencil of parallel light is incident normally on a solid transparent sphere of radius r. What should be the refractive index if the pencil is to be focussed (a) At the surface of the sphere, (b) At the centre of the sphere.
Answer» A narrow pencil of parallel light is incident normally on a solid transparent sphere of radius r. What should be the refractive index if the pencil is to be focussed (a) At the surface of the sphere, (b) At the centre of the sphere.

9635.

A narrow pencil of parallel light is incident normally on a solid transparent sphere of radius r. What should be the refractive index if the pencil is to be focussed (a) At the surface of the sphere, (b) At the centre of the sphere.

Answer»

A narrow pencil of parallel light is incident normally on a solid transparent sphere of radius r. What should be the refractive index if the pencil is to be focussed

(a) At the surface of the sphere,

(b) At the centre of the sphere.

Discussion

9636.	what is CN1,CN2,CN3,CN4 IN cc
Answer» what is CN1,CN2,CN3,CN4 IN cc

Discussion

9637.	Determine the energy stored in the surface of a soap bubble of radius 2.1 cm if its surface tension is 4.5×10−2 N/m.
Answer» Determine the energy stored in the surface of a soap bubble of radius $2.1 cm$ if its surface tension is $4.5 \times 10^{- 2} N/m$ .

Discussion

9638.	A 100 MVA synchronous generator operates at full load at a frequency of 50 Hz. The load is suddenly reduced to 50 MW. Due to time lag in governor system, the steam valve begins to close after 0.4 sec. The frequency at t = 0.4 sec is ______ Hz (Given H = 4 MJ/MVA)51.23
Answer» A 100 MVA synchronous generator operates at full load at a frequency of 50 Hz. The load is suddenly reduced to 50 MW. Due to time lag in governor system, the steam valve begins to close after 0.4 sec. The frequency at t = 0.4 sec is ______ Hz (Given H = 4 MJ/MVA) 51.23

Discussion

9639.	A bob is hanging over a pulley inside a car through a string. The second end of the string is in the hands of a person standing in the car. The car is moving with constant acceleration a directed horizontally as shown in figure. The other end of the string is pulled with constant acceleration a vertically. The tension in the string is equal is
Answer» A bob is hanging over a pulley inside a car through a string. The second end of the string is in the hands of a person standing in the car. The car is moving with constant acceleration $a$ directed horizontally as shown in figure. The other end of the string is pulled with constant acceleration $a$ vertically. The tension in the string is equal is

Discussion

9640.	50.Find equivalent resistance between A and B. A)7ohm. B 5ohm. C. 3ohm. D 14ohm Click
Answer» 50.Find equivalent resistance between A and B. A)7ohm. B 5ohm. C. 3ohm. D 14ohm Click

Discussion

9641.	In a cyclic process shown in the figure an ideal gas is adiabatically taken firm B to A, the work done on the gas during the process B ⟶ A is 30 J, when the gas is taken from A → B the heat absorbed by the gas is 20 J. The change in internal energy of the gas in the process A ⟶ B is
Answer» In a cyclic process shown in the figure an ideal gas is adiabatically taken firm B to A, the work done on the gas during the process B ⟶ A is 30 J, when the gas is taken from A → B the heat absorbed by the gas is 20 J. The change in internal energy of the gas in the process A ⟶ B is

9641.

In a cyclic process shown in the figure an ideal gas is adiabatically taken firm B to A, the work done on the gas during the process B ⟶ A is 30 J, when the gas is taken from A → B the heat absorbed by the gas is 20 J. The change in internal energy of the gas in the process A ⟶ B is

Answer»

In a cyclic process shown in the figure an ideal gas is adiabatically taken firm B to A, the work done on the gas during the process B ⟶ A is 30 J, when the gas is taken from A → B the heat absorbed by the gas is 20 J. The change in internal energy of the gas in the process A ⟶ B is

Discussion

9642.	46. What is rise in temp of a coolective drop when initially 1 gm and 2 gm drops travel with velocities 10 cm/sec and 15cm/sec?
Answer» 46. What is rise in temp of a coolective drop when initially 1 gm and 2 gm drops travel with velocities 10 cm/sec and 15cm/sec?

Discussion

9643.	A cylinder vessel of radius r filled with an ideal liquid is rotating about a vertical axis the centre of its circular base with cons†an t angular velocity ω find the difference in the heights of liquid at the centre of the vessel and edge of vessel
Answer» A cylinder vessel of radius r filled with an ideal liquid is rotating about a vertical axis the centre of its circular base with cons†an t angular velocity ω find the difference in the heights of liquid at the centre of the vessel and edge of vessel

Discussion

9644.	15.Time period of a simple pendulum is T and it's angular amplitude is θ_0 . Find the time taken by Bob to move from equilibrium position O to P if at this instant string makes an angle θ with vertical
Answer» 15.Time period of a simple pendulum is T and it's angular amplitude is θ_0 . Find the time taken by Bob to move from equilibrium position O to P if at this instant string makes an angle θ with vertical

Discussion

9645.	Find the number of oxygen atom present in 0.051 g of aluminium oxide.(Given: atomic mass of Al=27 u)
Answer» Find the number of oxygen atom present in $0.051 g$ of aluminium oxide. (Given: atomic mass of $A l = 27 u$ )

Discussion

9646.	A simple pendulum with a Bob of mass m and length l is held in a position at angle of thitha with the vertical line. It's speed when it passes the lowest position is ?
Answer» A simple pendulum with a Bob of mass m and length l is held in a position at angle of thitha with the vertical line. It's speed when it passes the lowest position is ?

Discussion

9647.	Starting from rest, a body slides down a 45∘ inclined plane in twice the time it takes to slide down the same distance in the absence of friction (with same inclination). The coefficient of friction between the body and the inclined plane is
Answer» Starting from rest, a body slides down a $45^{\circ}$ inclined plane in twice the time it takes to slide down the same distance in the absence of friction (with same inclination). The coefficient of friction between the body and the inclined plane is

Discussion

9648.	A transverse wave is travelling along a string from left to right. The figure below represents the shape of the string at a given instant. At this instant, among the following, choose the wrong statement
Answer» A transverse wave is travelling along a string from left to right. The figure below represents the shape of the string at a given instant. At this instant, among the following, choose the wrong statement

9648.

A transverse wave is travelling along a string from left to right. The figure below represents the shape of the string at a given instant. At this instant, among the following, choose the wrong statement

Answer»

A transverse wave is travelling along a string from left to right. The figure below represents the shape of the string at a given instant. At this instant, among the following, choose the wrong statement

Discussion

9649.	A 1 kg block and a 0.5 kg block move together ona horizontal frictionless surface. Each block exertsa force of 6 N on the other. The blocks move witha uniform acceleration ofF1 kg 0.5 kg(1) 3 m/s2(3) 9 m/s2(2) 6 m/s2(4) 12 m/s2lt hola is nierc
Answer» A 1 kg block and a 0.5 kg block move together ona horizontal frictionless surface. Each block exertsa force of 6 N on the other. The blocks move witha uniform acceleration ofF1 kg 0.5 kg(1) 3 m/s2(3) 9 m/s2(2) 6 m/s2(4) 12 m/s2lt hola is nierc

Discussion

9650.	The range of projectile is R when the angle of projection is 55∘. For the same velocity of projection and range, the other possible angle of projection is
Answer» The range of projectile is $R$ when the angle of projection is $55^{\circ}$ . For the same velocity of projection and range, the other possible angle of projection is

Discussion

Explore topic-wise InterviewSolutions in .

Consider the MUX circuit shown in the figure below;the output function 'f' can be represented as

Two satellites are moving around the earth in circular orbits at height R and 3R respectively, R being the radius of the earth, the ratio of their kinetic energies is

The gravitational field in a region is given by E=(2i+3j)N/kg.The equation of the line on which no work is done by the gravitational when the particle is moved

A particle at rest is projected from the origin moves in x−y plane with a velocity of →v=(3^i+6x^j) m/s, where ^i and ^j are unit vectors along +x and +y axis. Which of the following equations represent the equation of path followed by the particle?

two charge reple each outher with a force of 200N % . one of the cgarges is increased by 20% and other is reduced by10%. the new repulsive force at same dis†an ce would be pjo

Find dydx, if x and y are connected parametrically by the equations given in questions without eliminating the parameter. x=a cos θ, y=b cos θ

Force acting on a particle is 10 N. If units of length and time are doubled and the unit of mass is halved then find the numerical value of force in the new system of units.

Given figure shows a sound filter in which sound is passing through a bifurcated pipe. Speed of sound in air is 300 m/sec. A sound consists of four frequencies 300 Hz,600 Hz,900 Hz,1500 Hz. Then which of the following frequency will pass through outles

A stationary horizontal disc is free to rotate about its axis. When a torque is applied on it, its kinetic energy as a function of θ, where θ is the angle by which it has rotated, is given as kθ2. If its moment of inertia is I, then the angular acceleration of the disc will be:

Energy of photon whose frequency is 1012MHz, will be

2.What is Magnetic Effect of Electric current?

For moon, g=1.67 ms−2 and R=1.74×106 m.The Moon's mass is ___ ×1022 kg.7.6

29. A particle is projected with velocity 2\sqrt{}g\sqrt{}h such that it crosses two walls of height h separated by 2h .What is the angle of projection?

Find the flux of the electric field through a spherical surface of radius R due to a charge of 10−7 C at the centre and another equal charge at a point 2R away from the centre.(Take ϵo=9×10−12 C2/N-m2 )

A vertical off-shore structure is built to withstand a maximum stress of 109 Pa. Is the structure suitable for putting up on top of an oil well in the ocean? Take the depth of the ocean to be roughly 3 km, and ignore ocean currents.

How neutron made

35.Two points A and B lying on Y-axis at distance 12.3 cm and 12.5 cm from the origin. The potentials at these points are 56 V and 54.8 V respectively, then the component of force on a charge of 4 micro C placed at A along Y-axis will be?

What is the minimum speed I need to cross the river which is flowing in the west direction at 3 Km/hr? Beware of the crocodiles.

A satellite of mass m, initially at rest on the earth, is launched into a circular orbit at a height equal to the radius of the earth. The minimum energy required is xmgRy, where x and y are numbers. Find the value of x + y. ___

A block placed on a horizontal surface is being pushed by a force F making an angle θ with the vertical. If the friction coefficient is μ, how much force is needed to get the block just started.

Two unchanged spheres are rubbed together and then separated by a distance of 2cm in air. If the force of attraction between them is 22.5N. Then the number of electrons lost by positively charged sphere is

Just outside a sharp point on a conductor we will have a larger electric field than just outside gradually curving palces on the conductor,why not voltage

At 0∘C pressure measured by barometer is 760 mm. What will be pressure at 100∘C

A sphere of mass M and radius R2 has a concentric cavity of radius R1 as shown in figure. The force F exerted by the sphere on a particle of mass m located at a distance r from the center of sphere varies as (0 ≤ r ≤ ∞)

A narrow pencil of parallel light is incident normally on a solid transparent sphere of radius r. What should be the refractive index if the pencil is to be focussed (a) At the surface of the sphere, (b) At the centre of the sphere.

what is CN1,CN2,CN3,CN4 IN cc

Determine the energy stored in the surface of a soap bubble of radius 2.1 cm if its surface tension is 4.5×10−2 N/m.

A 100 MVA synchronous generator operates at full load at a frequency of 50 Hz. The load is suddenly reduced to 50 MW. Due to time lag in governor system, the steam valve begins to close after 0.4 sec. The frequency at t = 0.4 sec is ______ Hz (Given H = 4 MJ/MVA)51.23

50.Find equivalent resistance between A and B. A)7ohm. B 5ohm. C. 3ohm. D 14ohm Click

In a cyclic process shown in the figure an ideal gas is adiabatically taken firm B to A, the work done on the gas during the process B ⟶ A is 30 J, when the gas is taken from A → B the heat absorbed by the gas is 20 J. The change in internal energy of the gas in the process A ⟶ B is

46. What is rise in temp of a coolective drop when initially 1 gm and 2 gm drops travel with velocities 10 cm/sec and 15cm/sec?

A cylinder vessel of radius r filled with an ideal liquid is rotating about a vertical axis the centre of its circular base with cons†an t angular velocity ω find the difference in the heights of liquid at the centre of the vessel and edge of vessel

15.Time period of a simple pendulum is T and it's angular amplitude is θ_0 . Find the time taken by Bob to move from equilibrium position O to P if at this instant string makes an angle θ with vertical

Find the number of oxygen atom present in 0.051 g of aluminium oxide.(Given: atomic mass of Al=27 u)

A simple pendulum with a Bob of mass m and length l is held in a position at angle of thitha with the vertical line. It's speed when it passes the lowest position is ?

Starting from rest, a body slides down a 45∘ inclined plane in twice the time it takes to slide down the same distance in the absence of friction (with same inclination). The coefficient of friction between the body and the inclined plane is

A transverse wave is travelling along a string from left to right. The figure below represents the shape of the string at a given instant. At this instant, among the following, choose the wrong statement

A 1 kg block and a 0.5 kg block move together ona horizontal frictionless surface. Each block exertsa force of 6 N on the other. The blocks move witha uniform acceleration ofF1 kg 0.5 kg(1) 3 m/s2(3) 9 m/s2(2) 6 m/s2(4) 12 m/s2lt hola is nierc

The range of projectile is R when the angle of projection is 55∘. For the same velocity of projection and range, the other possible angle of projection is